Suggestions by @sam2020

Adam Wylie

as J.T. in Ben 10: Race Against Time (Animated Version)

Dee Bradley Baker

as J.T. in Ben 10: Race Against Time (Animated Version)

Robert Picardo

as Principal Edward White in Ben 10: Race Against Time (Animated Version)

Alex Winter

as Constantine Jacobs in Ben 10: Race Against Time (Animated Version)

Andy Sturmer

as Composer in Ben 10: Race Against Time (Animated Version)

Alex Winter

as Director in Ben 10: Race Against Time (Animated Version)

Billy Connolly

as NRG in Ben 10: Ultimate Alien (Live action TV show)

Adam Driver

as Kevin Levin in Ben 10: Ultimate Alien (Live action TV show)

Nathan Keyes

as Kevin Levin in Ben 10: Ultimate Alien (Live action TV show)

Don McManus

as Carl Tennyson in Ben 10: Race Against Time (Animated Version)

Beth Littleford

as Sandra Tennyson in Ben 10: Race Against Time (Animated Version)

Jeff Bridges

as Grandpa Max Tennyson in Ben 10: Race Against Time (Animated Version)

Hayden Christensen

as Heatblast in Ben 10: Race Against Time (Animated Version)

Dee Bradley Baker

as Wildmutt in Ben 10: Race Against Time (Animated Version)

Christien Anholt

as Eon (Ben) in Ben 10: Race Against Time (Animated Version)

Peter Cullen

as Diamondhead in Ben 10: Race Against Time (Animated Version)

Steve Buscemi

as Grey Matter in Ben 10: Race Against Time (Animated Version)

Hayden Christensen

as Heatblast in Ben 10: Race Against Time (Animated Version)

David Kaye

as Heatblast in Ben 10: Race Against Time (Animated Version)

Dee Bradley Baker

as Heatblast in Ben 10: Race Against Time (Animated Version)